Here is the full list of all 24 The Light Brigade achievements.
Cock an ally Light Brigade soldier's rifle.
Kill an enemy sniper from far away.
Land 250 headshots. (accumulated)
Hold onto 1,000 coins at once during a run.
Reload 100 times. (accumulated)
Use an enemy's dropped weapon to kill another enemy.
Land 250 gunshots. (accumulated)
Try to fire your weapon without first reloading it.
Defeat the first boss.
Rescue an ally Light Brigade soldier out on a run.
Travel 1,000 meters. (accumulated)
After death, find your ghost and pray to it.
Pray to the Mother.
Die and be revived for the first time.
Finish your first run, start to finish.
Never miss a shot during a fully completed run.
Every single shot during a fully completed run is a headshot.
Use the wishing well.
Kill an enemy bomber using a grenade.
Kill an enemy priest using magic.
Spend 1,000 gold at a store.
Defeat the second boss.
Defeat the Father.
Have a hypnotized enemy kill another enemy.